“Yes. There was definitely a security guard who was staring at all the women's behinds and breasts as they were walking by," one woman said. "That made us feel extremely uncomfortable."

Guerrero noted that as she got closer to the Coachella stage, the crowds get tighter, which can be a recipe for inappropriate behavior.

It's not just at Coachella, as a video from a similar festival in New Zealand shows a guy sneaking up and touching a woman's bare breast. But then she turns on him, punching him repeatedly as the crowd cheers her on.

Papisova has a message for men at festivals:

“No outfit implies consent," she said. "No outfit is an invitation for sexual assault, being at a music festival, dancing to music, is not an invitation to be sexually harassed."

Safety experts recommend concertgoers stay with friends and never accept drinks from strangers.